I feel like you guys might be going overboard a bit (haha, overboard)
But first, let me apologize in advance in case I seem to make no sense or am repeating myself too often or am not going anywhere or I’m saying things that were already said in different words.
I don’t think this is much of a chicken and egg problem, the answer can be both in this case. Like, imagine that a gameboard is a book and someone wrote it. Then this someone made it so that Beatrice “made up” the red truth, when the red truth is actually a common knowledge in the metaverse.
It’s as simple as saying the creator made it so this world was born from Beatrice, making it true in the gameboard itself but not so much in the meta. As mentioned in the Discord discussion, multiple truths can exist, and can go both ways.
Also, I’m pretty sure there exist things within the meta, who take care of the kakeras in their own way. And while the lenses thing does make sense, I’m sure that these characters don’t sort of morph from universe to universe, maybe they just try to fit in and hide within the stories or gameboards in a way to not make the story focus on them too much, since they might be trying to either take care of the game board, kill off their boredom, or just cause chaos and havoc. In fact, didn’t Ryukishi consider some of the characters as actors who play different roles?
So I don’t really find the existence of Will and Dlanor all that weird in this context, they don’t necessarily need to be created by Yasu to exist.